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Title: Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms
Authors: Martinsson, Erik
Shahjamali, Mohammad Mehdi
Enander, Karin
Boey, Freddy
Xue, Can
Aili, Daniel
Liedberg, Bo
Keywords: Gold-coated silver nanoprisms
Localized surface plasmon resonance (LSPR)
Surface plasmon resonance (SPR)
Refractive index sensing
Issue Date: 2013
Source: Martinsson, E., Shahjamali, M. M., Enander, K., Boey, F., Xue, C., Aili, D., et al. (2013). Local Refractive Index Sensing Based on Edge Gold-Coated Silver Nanoprisms. The Journal of Physical Chemistry C, 117(44), 23148-23154.
Series/Report no.: The Journal of Physical Chemistry C
Abstract: Bulk and surface refractive index sensitivity for localized surface plasmon resonance (LSPR) sensing based on edge gold-coated silver nanoprisms (GSNPs) and gold nanospheres was investigated and compared with conventional surface plasmon resonance (SPR) sensing based on propagating surface plasmons. The hybrid GSNPs benefit from an improved stability since the gold frame protecting the unstable silver facets located at the silver nanoprisms (SNPs) edges and tips prevents truncation or rounding of their sharp tips or edges, maintaining a high refractive index sensitivity even under harsh conditions. By using layer-by-layer deposition of polyelectrolytes and protein adsorption, we found that GSNPs exhibit 4-fold higher local refractive index sensitivity in close proximity (<10 nm) to the surface compared to a flat gold film in the conventional SPR setup. Moreover, the sensitivity was 8-fold higher with GSNPs than with gold nanospheres. This shows that relatively simple plasmonic nanostructures for LSPR-based sensing can be engineered to outperform conventional SPR, which is particularly interesting in the context of detecting low molecular weight compounds where a small sensing volume, reducing bulk signals, is desired.
ISSN: 1932-7447
DOI: 10.1021/jp408187e
Schools: School of Materials Science & Engineering 
Research Centres: Centre for Biomimetic Sensor Science 
Rights: © 2013 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by The Journal of Physical Chemistry C, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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